CN114144685A - Power supply capacitor electrostatic capacitance measuring device and power supply capacitor electrostatic capacitance measuring method - Google Patents
Power supply capacitor electrostatic capacitance measuring device and power supply capacitor electrostatic capacitance measuring method Download PDFInfo
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- CN114144685A CN114144685A CN202080052551.6A CN202080052551A CN114144685A CN 114144685 A CN114144685 A CN 114144685A CN 202080052551 A CN202080052551 A CN 202080052551A CN 114144685 A CN114144685 A CN 114144685A
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- power supply
- supply capacitor
- electrostatic capacitance
- current
- charging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
- H01H33/6662—Operating arrangements using bistable electromagnetic actuators, e.g. linear polarised electromagnetic actuators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/14—Structural combinations or circuits for modifying, or compensating for, electric characteristics of electrolytic capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
Abstract
The invention provides a power supply capacitor electrostatic capacitance measuring device and method capable of suppressing reliability reduction and suppressing electrostatic capacitance measurement error of a power supply capacitor. A charging circuit is constituted by a power supply capacitor (16), a DC power supply (500) for charging the power supply capacitor (16), and a charging switch (501) for turning on and off the connection between the DC power supply (500) and the power supply capacitor (16). A charging circuit is provided with current sensors (504, 505) for detecting a charging current of a power supply capacitor (16). The electrostatic capacitance of the power supply capacitor (16) is measured based on a 1 st time (T1) taken until the power supply capacitor (16) starts to be charged until the current sensor (504) detects a 1 st current value (I1), a 2 nd time (T2) taken until the power supply capacitor (16) starts to be charged until the current sensor (505) detects a 2 nd current value (I2), and a time difference between the 1 st time (T1) and the 2 nd time (T2).
Description
Technical Field
The present invention relates to an apparatus and a method for measuring electrostatic capacitance of a power supply capacitor used in a switching device or the like.
Background
The switchgear is provided with a vacuum circuit breaker, and the vacuum circuit breaker is operated by an electromagnetic operating mechanism. As an electromagnetic operation mechanism for operating the vacuum circuit breaker, a power supply capacitor is used. When the capacitance of the power supply capacitor is measured, the charging/discharging lead is removed from the power supply capacitor, and the capacitance is measured by the capacitance.
As a technique for solving this problem, for example, there is a technique described in patent document 1. In patent document 1, a discharge circuit connected in parallel to a power supply capacitor discharges the power supply capacitor for a certain period of time, and the voltage of the power supply capacitor at that time is measured to measure the electrostatic capacitance.
Documents of the prior art
Patent document
Patent document 1: WO2010/150599
Disclosure of Invention
Problems to be solved by the invention
However, in the technique described in patent document 1, since a discharge circuit is additionally connected in parallel to the power supply capacitor in order to measure the capacitance of the power supply capacitor, there is a risk of a failure accompanying addition of the discharge circuit, and there is a problem of reliability degradation.
Further, if the initial voltage of the power supply capacitor varies when the discharge circuit is connected, the voltage value of the power supply capacitor after the discharge circuit is discharged for a certain time also varies, and there is a problem that an error occurs in the measurement of the capacitance of the power supply capacitor.
The invention aims to provide a power supply capacitor electrostatic capacitance measuring device and a power supply capacitor electrostatic capacitance measuring method, which can inhibit the reduction of reliability and inhibit the electrostatic capacitance measuring error of a power supply capacitor.
Means for solving the problems
In order to achieve the above object, the present invention is characterized in that a charging circuit is constituted by a power supply capacitor, a power supply for charging the power supply capacitor, and a charging switch for turning on and off connection between the power supply and the power supply capacitor, a current sensor for detecting a charging current of the power supply capacitor is provided in the charging circuit, and the electrostatic capacitance of the power supply capacitor is measured based on a 1 st time taken until the current sensor detects a 1 st current value, a 2 nd time taken until the power supply capacitor starts to be charged until the current sensor detects a 2 nd current value, and a time difference between the 1 st time and the 2 nd time.
Effects of the invention
According to the present invention, it is possible to provide a power supply capacitor electrostatic capacitance measuring device and a power supply capacitor electrostatic capacitance measuring method that can suppress a decrease in reliability and suppress an electrostatic capacitance measurement error of a power supply capacitor.
Drawings
Fig. 1 is a longitudinal sectional view of a switchgear including a vacuum circuit breaker of embodiment 1.
Fig. 2 is a diagram showing a detailed structure of a vacuum circuit breaker according to embodiment 1.
Fig. 3 is a vertical front sectional view of a vacuum circuit breaker according to embodiment 1.
Fig. 4 is a diagram showing a charge and discharge circuit of example 1.
Fig. 5 is a block diagram of the save/compare section in embodiment 1.
Fig. 6 is a graph showing the time characteristics of voltage and current at the time of charging the power supply capacitor of example 1.
Fig. 7 is a graph showing the time characteristics of voltage and current at the time of charging the power supply capacitor of example 1.
Fig. 8 is a graph showing the time characteristics of voltage and current at the time of charging the power supply capacitor of example 1.
Fig. 9 is a block diagram of a save/compare unit in embodiment 2.
Fig. 10 is a perspective view showing the structure of a current sensor according to example 3.
Fig. 11 is a perspective view showing the structure of a current sensor according to example 4.
Fig. 12 is a perspective view showing the structure of a current sensor according to example 5.
Detailed Description
Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. The following are merely examples of the implementation, and the present invention is not limited to the following specific embodiments. The present invention can be modified into various forms including the following forms.
(example 1)
Fig. 1 is a longitudinal sectional view of a switchgear including a vacuum circuit breaker of embodiment 1 of the present invention.
As shown in fig. 1, switchgear 150 is divided into a breaker chamber 154, a measurement instrument chamber 152 disposed above breaker chamber 154, a bus bar chamber 153 and a cable chamber 155 disposed on the rear sides of breaker chamber 154 and measurement instrument chamber 152.
A vacuum interrupter 156 is disposed within the interrupter chamber 154.
A controller 220 for controlling the opening and closing of the main contacts of the vacuum circuit breaker 156 is provided in the measuring chamber 152; a storage/comparison unit 221 for determining whether or not there is an abnormality in the state of the vacuum interrupter 156 and the type of the abnormality; when the storage/comparison unit 221 determines that the state of the vacuum interrupter 156 is abnormal, the abnormal state display unit 222 displays the abnormal state of the vacuum interrupter 156 by lighting (or turning off) a lamp, an image, a sound, or the like. The storage/comparison unit 221 sequentially stores the measurement results of the power supply capacitor electrostatic capacitance, and compares the newly measured result with the previously stored result to detect an abnormality.
The bus bar chamber 153 is provided with a bus bar 162 electrically connected to the fixed contact 7 of the vacuum interrupter 9 of the vacuum circuit breaker 156, and a power distribution cable 161 electrically connected to the movable contact 8 of the vacuum interrupter 9 of the vacuum circuit breaker 156.
A door is provided on the front surface (right side in fig. 1) of the housing of the switchgear 150, and if the door is opened, an operation panel including switches and the like provided on the front surface of the vacuum circuit breaker 156 is exposed. During maintenance, the worker can open the door to pull out the vacuum circuit breaker 156.
Next, the detailed structure of the vacuum interrupter 156 will be described. Fig. 2 is a diagram showing a detailed structure of a vacuum circuit breaker according to embodiment 1.
As shown in fig. 2, the vacuum circuit breaker 156 of the present embodiment roughly includes: a vacuum valve 9 having a main circuit opening/closing unit (fixed contact 7 and movable contact 8) inside; an electromagnetic operation device 1 for opening and closing a main circuit opening and closing portion (a fixed contact 7 and a movable contact 8) of the vacuum valve 9; and a link mechanism 2 connecting the electromagnetic operation device 1 and the vacuum valve 9.
The movable core 302 and the fixed core 306 of the electromagnetic operation device 1 are disposed facing each other, and are mainly composed of the electromagnetic operation device side rod 3 and the movable flat plate 317 connected to the movable core 302 that moves up and down in the vertical direction, the electromagnet 14 in which the electromagnet coil 17 (load) and the permanent magnet 304 are housed in the case 305, and are connected to the 1 st lever 22 via the pin 19, the connecting member 21, and the link mechanism 2. They are arranged within the housing 10.
Further, if an exciting current is supplied to the electromagnet coil 17, the movable core 302 is lowered, and when the electromagnetic operation device side lever 3 coupled to the movable core 302 is lowered, the 2 nd lever 23 is rotated, so that the coupling member 24 and the vacuum valve side lever 114 are raised, and the fixed contact 7 provided in the vacuum valve 9 is brought into contact with the movable contact 8.
The insulating frame 130 includes a main circuit portion including breaking portions 131 and 132, a fixed conductor 133, a vacuum interrupter 9, and a movable side conductor 134, and further includes a vacuum interrupter side lever 114, a friction spring 59, a shaft 25, and a breaking spring 60 in order to drive the movable contact 8 of the vacuum interrupter 9 to be separable from the fixed contact 7.
During the closing operation of the vacuum circuit breaker 156, the friction spring 59 and the breaking spring 60 are compressed, and elastic energy is accumulated, and the breaking operation is performed by the elastic energy. When the opening/closing portion of the vacuum valve 9 is in the on state, the movable iron core 302 and the movable flat plate 317 are held by the attraction force of the permanent magnet 304.
In the breaking operation of the solenoid-operated vacuum circuit breaker 156, a current in the direction opposite to the closing operation flows through the solenoid coil 17, a magnetic flux is generated in the direction of canceling the attraction force of the permanent magnet 304, and the elastic energy stored in the friction spring 59 and the breaking spring 60 is released, whereby the solenoid-operated device side lever 3 is lifted up, and the fixed contact 7 and the movable contact 8 provided in the vacuum valve 9 are separated.
When the electromagnetic operation device side lever 3 is raised, the shaft 25 moves upward, and the 3 rd lever (not shown) rotates in accordance with the movement of the shaft 25. The 3 rd lever is interlocked with the auxiliary switch 20, and the auxiliary switch 20 detects the state of the opening/closing portion of the vacuum valve 9 and controls the current flowing through the solenoid coil 17. In the entering operation, the 4 th lever (not shown) rotates counterclockwise around the pin, and moves to a position where the "on" character of the display panel (not shown) can be seen from the front side.
The auxiliary switch 20 measures the on-operation time and the off-operation time of the vacuum interrupter 156 based on the time difference between the operation time of the normally open contact and the normally closed contact, which are signal contacts, of the auxiliary switch 20 and the time of the on command and the off command (off command) generated by the control unit 220 (see fig. 1). Based on the measured time change of the on operation time and the off operation time, the state of the vacuum circuit breaker 156, such as consumption of the fixed contacts 7 and the movable contacts 8 in the vacuum interrupter 9, vacuum leakage of the vacuum interrupter 9, and increase in friction of the driving mechanism portion of the movable contacts 8, is determined.
Fig. 3 is a longitudinal front sectional view of the vacuum circuit breaker 156 of embodiment 1. A control board 18 extending in the vertical direction is fixed to the housing 10. Lead wire 514 extends from control board 18, and lead wire 514 is connected to auxiliary switch 20, power supply capacitor 16, and electromagnet coil 17. Current sensors 504 and 505 are mounted on a lead 514a of lead 514 through which a charging current of power supply capacitor 16 flows.
Fig. 4 is a diagram showing a charge and discharge circuit of example 1. The charging and discharging circuit is connected to each device through leads 514a and 514 b. Charging switch 501, charging resistor 502, and power supply capacitor 16 are connected to dc power supply 500 (power supply) via lead 514a, forming a charging circuit. Then, the charging switch 501 is turned on, and the power supply capacitor 16 is charged. When the power supply capacitor 16 is charged, the charging switch 501 is turned off.
The discharge switch 503 and the electromagnet coil 17 (load) are connected to the power supply capacitor 16 by a lead wire 514b, thereby forming a discharge circuit. Then, by turning on the discharge switch 503, a current is supplied from the power supply capacitor 16 to the electromagnet coil 17 (load), and the electromagnet 14 operates. When the electromagnet 14 is operated, the discharge switch 503 is turned off and the charge switch 501 is turned on, whereby the power supply capacitor 16 is recharged. The charging current at this time is measured by the current sensors 504 and 505.
Next, a method of measuring the capacitance of the power supply capacitor 16 will be described with reference to fig. 5 and 6. Fig. 5 is a block diagram of the storage/comparison unit 221 in example 1, and fig. 6 is a diagram showing time characteristics of voltage and current at the time of charging the power supply capacitor in example 1.
In fig. 5, an example is shown in which a plurality of digital current sensors are used. As shown in fig. 6, in the case where the initial voltage of the power supply capacitor is 0V, the power supply capacitor charging current 507 has the following characteristics: the voltage of the dc power supply divided by the charging resistance gradually decreases with time with a time constant CR until 0A. On the other hand, the power supply capacitor voltage 506 has a characteristic of gradually increasing from 0V to a predetermined dc power supply voltage with the time constant CR.
The current sensors 504 and 505 detect a charging current for charging the power supply capacitor 16. The current sensors 504 and 505 are, for example, sensors having normally open contacts whose detected current values have different sensitivities.
As shown in fig. 6, as the power supply capacitor charging current 507 gradually decreases with a time constant CR, when the output signal 601a of the current sensor 504 (1 st current sensor) crosses the current value I1 (1 st current value), it is switched from off to on. Similarly, when the output signal 602 of the current sensor 505 (current sensor No. 2) crosses the current value I2, the switch is switched from off to on. The output signal 601a of the current sensor 504 (1 st current sensor) and the output signal 602 of the current sensor 505 (2 nd current sensor) are switched from off to on with a time difference dt.
In embodiment 1, 2 current sensors are used in combination. The current sensors 504, 505 are adjusted to digitally switch outputs when the supply capacitor charging current 507 crosses current values I1, I2, respectively.
Then, when the current sensors 504 and 505 detect different current values, the sensors are switched from off to on. Then, if the difference between the timing at which the current sensor 504 is switched from off to on and the timing at which the current sensor 505 is switched from off to on is measured, the power supply capacitor electrostatic capacitance can be calculated.
The detection results detected by the current sensors 504 and 505 are stored in the storage units 520 and 521 of the storage/comparison unit 221, respectively.
In addition to the predetermined current value I1 (1 st current value), the storage unit 520 stores a time T1 (time of crossing the current value I1) which is the 1 st time taken for the current sensor 504 (1 st current sensor) to detect the predetermined current value I1 (1 st current value) after the start of charging the power supply capacitor 16.
In addition to the predetermined current value I2 (the 2 nd current value), the storage unit 521 also stores a time T2 (time of crossing the current value I2) which is the 2 nd time taken for the current sensor 505 (the 2 nd current sensor) to detect the predetermined current value I2 (the 2 nd current value) after the start of charging the power supply capacitor 16.
The current value I1 (1 st current value) and the current value I2 (2 nd current value) are different values. The detection results stored in the storage units 520 and 521 are transmitted to the difference calculation unit 522.
In difference calculation unit 522, capacitance C of power supply capacitor 16 is calculated from time difference dt between current values I1 and I2 and times T1 and T2 of cross current values I1 and I2 by the following equation.
C＝(1/R)·dt/(ln(I1/I2))
Here, if the current values I1, I2 and the charging resistance R are fixed, the power supply capacitor electrostatic capacitance C can be calculated by measuring the time difference dt.
Next, the power supply capacitor electrostatic capacitance C calculated by the difference calculation unit 522 is sent to the comparison unit 523, and the calculated power supply capacitor electrostatic capacitance C is compared with a predetermined time difference determination value 524 in the comparison unit 523. The comparator 523 determines whether or not the calculated power supply capacitor electrostatic capacitance C is lower than a time difference determination value 524, and outputs a command signal indicating an abnormality to the abnormal state display 222 if the calculated power supply capacitor electrostatic capacitance C is lower than the time difference determination value 524. Upon receiving the command signal, the abnormal state display unit 222 notifies the power supply capacitor of the abnormality.
In the above-described embodiment, both the current sensors 504 and 505 use normally open contact sensors, but for example, the current sensor 504 may be a normally closed contact sensor, and the current sensor 505 may be a normally open contact sensor, and the sensitivity of the current value detected by each sensor may be made different. As shown in fig. 6, as the power supply capacitor charging current 507 gradually decreases with a time constant CR, when the output signal 601b of the current sensor 504 (1 st current sensor) becomes 10s, the switch is made from on to off. Similarly, when the output signal 602 of the current sensor 505 (current sensor No. 2) becomes 15s, the switch is made from off to on. Further, if the logical and 603 of the output signal 601b of the current sensor 504 (1 st current sensor) and the output signal 602 of the current sensor 505 (2 nd current sensor) is monitored, the time difference dt can be measured, and the capacitance of the power supply capacitor 16 can be calculated. If the current sensors 504 and 505 are contact outputs, the logical and 603 can be easily obtained by connecting the respective outputs in series.
In the present embodiment, the current sensor 504 may be a normally open contact sensor, and the current sensor 505 may be a normally closed contact sensor. That is, one of the current sensor 504 (1 st current sensor) and the current sensor 505 (2 nd current sensor) may include a normally closed contact, and the other may include a normally open contact.
In the present embodiment, even when the capacitance of the power supply capacitor 16 is different, the capacitance of the power supply capacitor 16 can be measured.
Fig. 7 is a graph showing time characteristics of voltage and current at the time of charging of the power supply capacitor of example 1, and shows characteristics of the power supply capacitor including a capacitance having a value smaller than that of the power supply capacitor used in fig. 6. In fig. 6, if the current values I1 and I2 are set to be equal to those in fig. 6, the calculated time difference dt is reduced in proportion to the capacitance of the power supply capacitor.
Fig. 8 is a graph showing the time characteristics of voltage and current at the time of charging of the power supply capacitor of example 1, and shows the characteristics of the power supply capacitor in which the initial voltage of the power supply capacitor 16 includes a higher value of electrostatic capacitance than that of fig. 7. In this case, although both the times T1 and T2 move to zero, the time difference dt thereof remains the same as that in fig. 7, and therefore the capacitance can be measured while suppressing the variation in capacitance due to the difference in initial voltage of the power supply capacitor 16.
According to the present embodiment, since the time difference dt between the times T1 and T2 when the power supply capacitor charging current 507 crosses the current values I1 and I2 is measured, the capacitance of the power supply capacitor 16 can be calculated while suppressing the influence of the initial voltage of the power supply capacitor.
In addition, according to the present embodiment, since it is not necessary to newly provide a discharge circuit when measuring the capacitance of the power supply capacitor, it is possible to provide the power supply capacitor capacitance measuring device in which the decrease in reliability is suppressed.
(example 2)
Next, embodiment 2 will be described with reference to fig. 9. The same reference numerals are given to the same components as those in embodiment 1, and detailed description thereof will be omitted. Fig. 9 is a block diagram of the save/compare unit 221 in embodiment 2. The difference from embodiment 1 is that the number of current sensors is set to a single number (1).
In example 2, only 1 current sensor capable of continuously measuring a current was provided, and the output thereof was continuously monitored by a microcomputer, and a time difference between the power supply capacitor charging current 507 and the current values I1 and I2 was calculated.
In fig. 9, an example using a single analog current sensor is employed. In fig. 9, detection values continuously detected by a current sensor 901 are sent to comparison units 902 and 903, and compared with current determination values 904 and 905, respectively. The current determination values 904 and 905 store current values I1 and I2, respectively, and the detection values continuously detected by the current sensor 901 are compared with the current values I1 and I2.
The comparison unit 902 determines the time when the analog current value continuously output from the current sensor 901 becomes the current value I1 (1 st current value), and stores the time in the storage unit 520. Similarly, the comparison unit 903 determines the time when the analog current value continuously output from the current sensor 901 becomes the current value I2 (the 2 nd current value), and stores the time in the storage unit 521. The subsequent processing is the same as in example 1, and therefore, detailed description thereof is omitted.
According to the present embodiment, since the time difference dt between the times T1 and T2 when the power supply capacitor charging current 507 crosses the current values I1 and I2 is measured, the capacitance of the power supply capacitor 16 can be calculated while suppressing the influence of the initial voltage of the power supply capacitor. In addition, since the calculation of the electrostatic capacitance of the power supply capacitor 16 is realized by 1 current sensor, the cost can be reduced.
Further, according to the present embodiment, since it is not necessary to newly provide a discharge circuit when measuring the capacitance of the power supply capacitor, it is possible to provide the power supply capacitor capacitance measuring device in which the decrease in reliability is suppressed.
(example 3)
Next, embodiment 3 will be described with reference to fig. 10. Fig. 10 is a perspective view showing the structure of a current sensor according to example 3.
In fig. 10, the current sensor according to example 3 is composed of a reed switch 401 and a ring-shaped core 402. A slit portion 403 that opens to the outside in the radial direction at a part of the outer periphery of the annular magnetic core 402 and a hollow portion 404 that communicates with the slit portion 403 in the radial direction are formed in the annular magnetic core 402, and a lead wire 514 is disposed in the hollow portion 404 so as to penetrate the hollow portion 404. The gap in the slit portion 403 is formed larger than the diameter of the lead 514, and the lead 514 is inserted from the slit portion 403 and positioned in the hollow portion 404. Hollow portion 404 is also formed to be larger than the diameter of lead 514.
The current sensor operates the reed switch 401 by magnetic flux leaking from the slit portion 403.
The outer contour of the reed switch 401 is formed of a glass tube, and 2 ferromagnetic reeds are arranged inside the glass tube.
In the case where the reed switch 401 is always normally open, 2 ferromagnetic reeds are opposed to each other with a constant contact interval. When a magnetic field is applied to the lead wire of the normally open contact from the outside, the lead wire is magnetized, and the opposite free ends absorb each other to make contact, whereby the circuit can be closed, and when the magnetic field is removed, the circuit can be opened by the elasticity of the lead wire.
In the case where the reed switch 401 is a normally closed contact, the contacts of 2 ferromagnetic reeds are in contact and opposed. If a magnetic field is applied to the lead wires of the normally closed contacts from the outside, the lead wires are magnetized, the opposite free ends are separated from each other, and the circuit can be opened, and if the magnetic field is eliminated, the circuit can be closed by the elasticity of the lead wires.
In example 3, in order to measure the charging current of power supply capacitor 16, lead 514 is passed through annular core 402, and the lead of reed switch 401 disposed adjacent to annular core 402 is magnetized by the magnetic flux leaking from slit portion 403 of annular core 402, and operated. Further, in the case of being applied to embodiment 1, 2 current sensors of embodiment 3 are included.
According to embodiment 3, the current can be measured in a non-contact manner.
Further, according to embodiment 3, by providing a gap through which the lead wire 514 is passed in the lateral direction in the ring-shaped magnetic core 402 and a part of the reed switch 401, and securing a width through which the lead wire 514 is passed in the lateral direction also in the slit portion 403, it is possible to mount the current sensor later without detaching the conventional lead wire 514.
Further, according to embodiment 3, since the reed switch is a sealed structure, the reliability can be improved.
In example 3, the sensitivity can be adjusted by adjusting the width of the slit portion 403 and the gap between the annular core 402 and the reed switch 401.
(example 4)
Next, embodiment 4 will be described with reference to fig. 11. The same reference numerals are given to the same components as those in embodiment 3, and detailed description thereof will be omitted. Fig. 11 is a perspective view showing the structure of a current sensor according to example 4. The difference from embodiment 3 is that 2 ring cores are provided.
In example 4, 2 annular cores including the 1 st annular core 402a and the 2 nd annular core 402b are provided, and the reed switch 401 is disposed between the 1 st annular core 402a and the 2 nd annular core 402 b.
The 1 st annular core 402a is formed with a slit portion 403a in which a part of the outer periphery of the 1 st annular core 402a is open to the outside in the radial direction and a hollow portion 404a communicating with the slit portion 403a in the radial direction, and a lead wire 514 is disposed in the hollow portion 404a so as to penetrate the hollow portion 404 a. The gap in the slit portion 403a is formed larger than the diameter of the lead 514, and the lead 514 is inserted from the slit portion 403a and positioned in the hollow portion 404 a. Hollow portion 404a is also formed to be larger than the diameter of lead wire 514.
Similarly, a slit portion 403b in which a part of the outer periphery of the 2 nd ring core 402b is opened to the outside in the radial direction and a hollow portion 404b communicating with the slit portion 403b in the radial direction are formed in the 2 nd ring core 402b, and a lead wire 514 is arranged in the hollow portion 404b so as to penetrate the hollow portion 404 b. The gap in the slit portion 403b is formed larger than the diameter of the lead 514, and the lead 514 is inserted from the slit portion 403b and positioned in the hollow portion 404 b. Hollow portion 404b is also formed to be larger than the diameter of lead 514.
According to embodiment 3, since the 1 st annular core 402a and the 2 nd annular core 402b are arranged so as to sandwich the reed switch 401, the sensitivity of the current sensor can be improved.
(example 5)
Next, embodiment 5 will be described with reference to fig. 12. The same reference numerals are given to the same components as those in embodiment 3, and detailed description thereof will be omitted. Fig. 12 is a perspective view showing the structure of a current sensor according to example 5. The difference from embodiment 3 is that 2 reed switches are provided.
In example 5, 2 reed switches including the 1 st reed switch 401a and the 2 nd reed switch 401b are provided, and the annular core 402 is disposed between the 1 st reed switch 401a and the 2 nd reed switch 401 b.
When the gap between the 1 st reed switch 401a and the annular core 402 is G1 and the gap between the 2 nd reed switch 401b and the annular core 402 is G2, the current value at which the 1 st reed switch 401a operates and the current value at which the 2 nd reed switch 401b operates can be changed by changing the distance between G1 and G2.
That is, according to embodiment 5, by changing the distance between G1 and G2, two output signals having different sensitivities can be obtained.
In addition, according to embodiment 5, it is possible to further reduce the size as compared with the case where two current sensors are mounted as in embodiment 3.
The present invention is not limited to the above-described embodiments, and various modifications are possible.
The above-described embodiments are described in detail for easy understanding of the present invention, and are not limited to the embodiments including all the structures described.
Description of the reference numerals
1 … electromagnetic operating device, 2 … link mechanism, 3 … electromagnetic operating device side lever, 7 … fixed contact, 8 … movable contact, 9 … vacuum valve, 10 … case, 14 … electromagnet, 16 … power capacitor, 17 … electromagnet coil, 18 … control board, 19 … pin, 20 … auxiliary switch, 21 … connecting member, 22 … 1 st lever, 23 … nd lever, 24 … connecting member, 25 … shaft, 59 … friction spring, 60 … breaking spring, 114 … vacuum valve side lever, 130 … insulating frame, 131 … breaking portion, 132 … breaking portion, 133 … fixed conductor, 134 … movable side conductor, 150 … switching device, 152 … measuring device chamber, 153 … bus chamber, 154 … breaker chamber, 155 … cable chamber, … vacuum breaker, 161 power distribution bus 220, 36162 control portion, … storage …/comparison state display portion 222, and … comparison display portion, 302 … movable core, 304 … permanent magnet, 305 … case, 306 … fixed core, 317 … movable flat plate, 401 … reed switch, 401a … 1 st reed switch, 401b … 2 nd reed switch, 402 … ring core, 402a … 1 st ring core, 402b … nd 2 nd ring core, 403 … slit portion, 403b … slit portion, 404 … hollow portion, 404a … hollow portion, 404b … hollow portion, 500 … dc power supply, 501 … charging switch, 502 … charging resistor, 503 … discharging switch, 504 … current sensor, 505 … current sensor, 506 … power supply capacitor voltage, 507 … power supply capacitor charging current, 514 … lead, 514a … lead, 514b … lead, 520 … storage portion, 36521 … storage portion, 522 … difference calculation portion, 523 … comparison portion, 524 … time difference determination value, 603 a … logic comparison with …, … current sensor portion, … comparison portion, … current comparison portion, 36903 portion, 904 … current determination value, 905 … current determination value.
Claims (10)
1. A kind of power capacitor electrostatic capacitance measuring device, characterized by that:
a charging circuit including a power supply capacitor, a power supply for charging the power supply capacitor, and a charging switch for turning on and off the connection between the power supply and the power supply capacitor,
a current sensor for detecting a charging current of the power supply capacitor is provided in the charging circuit,
the power supply capacitor electrostatic capacitance measuring device includes a storage/comparison unit that measures the electrostatic capacitance of the power supply capacitor based on a 1 st time taken for starting charging of the power supply capacitor until the current sensor detects a 1 st current value, a 2 nd time taken for starting charging of the power supply capacitor until the current sensor detects a 2 nd current value, and a time difference between the 1 st time and the 2 nd time.
2. The power supply capacitor electrostatic capacitance measuring apparatus according to claim 1, characterized in that:
the power supply device comprises a discharge circuit consisting of a load and a discharge switch, wherein the load is driven by the power supply capacitor, and the discharge switch switches on and off the connection between the power supply capacitor and the load.
3. A power supply capacitor electrostatic capacitance measuring apparatus as claimed in claim 1 or 2, characterized in that:
the current sensor includes a 1 st current sensor for measuring the 1 st current value and a 2 nd current sensor for measuring the 2 nd current value.
4. A power supply capacitor electrostatic capacitance measuring apparatus as claimed in claim 3, wherein:
the 1 st current sensor and the 2 nd current sensor have different sensitivities for detecting a current value.
5. The power supply capacitor electrostatic capacitance measuring apparatus according to claim 4, characterized in that:
the outputs of the 1 st and 2 nd current sensors are digitally switchable, with either of the 1 st and 2 nd current sensors having normally closed contacts and the other having normally open contacts.
6. A power supply capacitor electrostatic capacitance measuring apparatus as claimed in claim 1 or 2, characterized in that:
the output of the current sensor is a continuously output analog current value.
7. A power supply capacitor electrostatic capacitance measuring apparatus as claimed in claim 1 or 2, characterized in that:
the current sensor is composed of an annular magnetic core and a reed switch,
the ring-shaped magnetic core includes a slit portion having an outer periphery of which a part is open to the outside in the radial direction and a hollow portion communicating with the slit portion in the radial direction and in which leads are arranged,
the reed switch is operated by the magnetic flux leaking from the slit portion.
8. The power supply capacitor electrostatic capacitance measuring apparatus according to claim 7, characterized in that:
the ring-shaped magnetic cores include a 1 st ring-shaped magnetic core and a 2 nd ring-shaped magnetic core,
the reed switch is disposed between the 1 st annular core and the 2 nd annular core.
9. The power supply capacitor electrostatic capacitance measuring apparatus according to claim 7, characterized in that:
the reed switches include a 1 st reed switch and a 2 nd reed switch,
the annular core is disposed between the 1 st reed switch and the 2 nd reed switch.
10. A kind of power capacitor electrostatic capacitance measuring device, characterized by that:
a charging circuit including a power supply capacitor, a power supply for charging the power supply capacitor, and a charging switch for turning on and off the connection between the power supply and the power supply capacitor,
the electrostatic capacitance of the power supply capacitor is measured based on a 1 st time taken for the power supply capacitor to start charging until a 1 st current value is detected by a current sensor included in the charging circuit, a 2 nd time taken for the power supply capacitor to start charging until a 2 nd current value is detected by the current sensor, and a time difference between the 1 st time and the 2 nd time.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-181090 | 2019-10-01 | ||
| JP2019181090A JP7311380B2 (en) | 2019-10-01 | 2019-10-01 | Power supply capacitor capacitance measurement device and power supply capacitor capacitance measurement method |
| PCT/JP2020/030956 WO2021065219A1 (en) | 2019-10-01 | 2020-08-17 | Power capacitor electrostatic capacitance measurement device and power capacitor electrostatic capacitance measurement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114144685A true CN114144685A (en) | 2022-03-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080052551.6A Pending CN114144685A (en) | 2019-10-01 | 2020-08-17 | Power supply capacitor electrostatic capacitance measuring device and power supply capacitor electrostatic capacitance measuring method |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4040170A4 (en) |
| JP (1) | JP7311380B2 (en) |
| CN (1) | CN114144685A (en) |
| WO (1) | WO2021065219A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116679144B (en) * | 2023-06-06 | 2023-12-19 | 深圳市创容新能源有限公司 | Capacitor test equipment and test method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP4040170A4 (en) | 2023-12-20 |
| JP2021056147A (en) | 2021-04-08 |
| WO2021065219A1 (en) | 2021-04-08 |
| EP4040170A1 (en) | 2022-08-10 |
| JP7311380B2 (en) | 2023-07-19 |
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